Visit the Angel Bibi and ask her about it, then a few festivals later (or the next one if she's already been in a few) a scene will play at the festival and then Hyper is unlocked.
I'm busy.
Hailey/Jessica: Visit them directly looking for new speech options and follow directions on screen; shouldn't be more complicated than that, if anything I may have forgotten to insert a "You did this already" message.
Pawamomo: Park -> Find a note -> Decipher Riddle (see below)
Impregnate Uxie Heavy or Above -> Revisit Town Hall -> Attempt to visit Uxie again -> Receive new things -> Swim Park -> Tori (Mermaid Homes) -> Shear